Thread-cutting tool



J1 H.'ZOERMAN. THREAD CUTTING TooL'. APPLICATION FILED JUNE 14. I920.

Patented Aug 2 SHEETS-SHEET l- JObh/ZZOQ'mQH 1. H.ZOERMAN.' THREAD CUTTING TOOL.

APPLICATION FILED JUNE 14, I920.

1,426Q441, PatentedAug. 22, 1922.

2 SHEETS-SHEET 2 im m! "entree stares earner ;orric JOHN H. ZOERMAN, on CHICAGO, rumors. THREAD-CUTTING 'rooL. I i I i Application filed June 14, 1920. Seria1 No. 388,725.

T 0 all 107L022: it may concern.

Be it known that 1, JOHN IiZonntmn, a citizen of the United Statesofrkmerica, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Thread Cutting Tools; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and usethe same.

This invention relates to thread cutting tools and is primarily concerned with various useful and novel improvements in the construction of-the tool shown in U. S. Pattent No. 1,005,604, issued October 10, 1911 having reference chiefly to anovel way of attaching the operating handles thereto so that the same may beextended for use when the tool'is to be operated, or folded on: to the body'of the tool to compact the same for shipment, and to a further sectional construction of the thread cutting dies whereby if any die section becomes broken" or otherwise useless, it may be readily removed and replaced by another without the necessity of throwing'away remaining-good portions of the die as is necessary when the dies are made in one piece. Further objects and purposes of the invention, together with novel constructions and arrangements of parts for attaining the same will appear fully and in detail as understanding of the invention is had from the following description, taken in connection with the accompanying draw-.

ings, in which,

Fig. 1 is an elevation of the thread cutting tool.

Fig. 2 is a plan of the construction shown in Flg. 1.

Fig. 3 is a View similar to Fig. 1, but with thehandles in folded position and with the inner end of one handle shown in section to disclose its method of attachment to the tool.

Fig. 1 is a fragmentary longitudinal section through the inner end of one handle and the adjacent parts of the tool.

Fig. 5 is a fragmentary enlarged partial sectional and elevational view showing the manner in which the sectional dies are secured detachably in place on the tool.

Fig. 6 is a perspective view of one of the sectional dies, and

Fig, 7 is a fragmentary transverse section throughone' of the sectional dies and theadjarent bar on which itis mounted."

Like reference characters refer to like parts in the different viewsof the drawings.

In the construction of the tool, two bars" 1 and 1 are used, each being widened at its ends as indicated at 2, 2 there being "a rel atlvely long recess at each side of the'bar" between the ends 2, 2 in which the dies,

hereafter described, are located. ""At one end the ends of the bars are divided tomake spaced apart ears 3, while a lug 4: projects outwardly from the opposite end of'e'ach' bar.

Spaced apart ears 5 are formed integral with the bars 1 and 1 thereof,

v at opposite ends" promoting from the widened portions thereof, and between said ears memhers 6 are pivotally mounted, each having a threaded shank 7 on which a hollow handle 8 is secured. Each of said handles is madefrom tubing closed at its outer end and in teriorly' threaded at its inner end'.'- When in the position shown in'Fig. l, the-handles may be turned to engage against one'side-of the ears 5 and will be locked in such posi tionagainst movement. WVhen the tool is'not 1n use, the handles may be turned to loosen their engagement with the ears, after which i the handles with the connected members 6 may be turned tothe position shown in Fig. 3 and then turned against the opposite sides of the cars, against movement.

A link 9 lies at its ends between the ears 3'at the ends of bars 1 and 1 and is pivot ally connected to said ears. An arm 10 is pivotally connected to one of the lugs 4 at the opposite end of the bar 1 and passes over and detachably engages the similar lug on bar 1*, a set screw 11 threading through the end of thearm against said lug to secure itdetachably inplace. It is evident that on loosening the set screw 11, the bars 1 and 1 may be turned one around the other so as to bring the dies carried on opposite sides thereof into operative relation to each other. The notcheddisk 12 at the point of pivotal connection of one end of the link 9 to the bar 1 is similar to a like notched adjusting disk in the patent above mentioned and is for the same purpose, to adjust the difference between the dies on the bars. As it forms no novel portion of the present invention it is not further described.

again locking the handles sion 17 and the adjacent portions of the endv sections 14 are cutaway and notched so that said extensions 17 may pass therein as shown. Removable securing screws 18 of the form shown in Fig. 5 are threaded into the enlargedends 2 of the bars, the same engagmg with the end sections 14, forcing them to place and holding them securely against movement. The middle section is held by the end sections 14 together with the engag'ement with rib 16 which prevents any possible movement which would. bring the extensions 17 out from under the overhanging parts of the end sections 14.

If more than three sectional dies on a side are used, a slight difference in construction is used. I have shown five sections to the dies on the outer sides of bars 1 and 1 in Fig. 1,- the middle section 13 and the end sections 14 14 being the same as sections 13' and 14 heretofore described so far as the under side construction is concerned while the additional sections 19 are provided with extensions 17 a at one end to go in the recesses in the end sections 14 and recesses at the other end to receive the extensions on the middle section 13 as shown. he sections are held in place by screws 18 the same as heretofore described with reference to the three section construction.

Each of the sections is made as one half of a thread cutting die and cooperates with the similar section on the opposite bar to make a complete cutting die. If any section becomes broken or otherwise useless, it is easy to replace it with a new section without throwing away the other good sections. This is an important feature of my invention, the value of which is evident. The invention is defined in the appended claims and I consider myself entitled to all constructions'which come within the scope or such claims.

I claim:

1. A device of the comprising a pair of members adapted to lie substantially parallel to each other and' having coacting die faces on adjacent sides a handle pivotally connected at an end of each member, said members having the handles attached thereto at opposite ends, and said handles being movable from folded position against said members to operative po sition extending from said members, and means for locking the handles against movement in either position.

2. A device of the character described comprising a pair of members adapted to lie substantiallyparallel to each other and having coacting die faces on adjacent sides, a pair of cars projecting laterally from each member adjacent an end thereof, said ears projecting from opposite ends of the members, a member having a threaded shank piv-' otally mounted between the ears of each pair of ears, and a handle threaded on to each .Off said shanks, substantially as and for the purposes described.

In testimonywhereof I affiX my signature; JOHN H. ZOERMAN,

character described 

